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Temp gauge pegged hot on or off even when cold

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Wire is broken or plug to that water temp sensor is disconnected/ loose

Posted on Apr 16, 2015

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1 Answer

Temperature gauge pegged hot at all times on or off even when cold


you have a short in the wire or wires coming from temp sensor check for melted or broken bare wires

Apr 15, 2015 | Cars & Trucks

1 Answer

Temp gauge on 1986 s-10 blazer 4x4 2.8 stays pegged on hot. on or off doesn't matter. i have replaced sender and sensor. any ideas?


Could be a short in the cluster, but its probably a faulty gauge. It should move when you cut off power.

Aug 30, 2014 | Cars & Trucks

1 Answer

Temp gauge on 1986 s-10 blazer 4x4 2.8 stays pegged on hot. on or off doesn't matter. i have replaced sender and sensor. any ideas?


If you replaced everything back to the guage itself, then it has to be the guage itself. I would try getting a replacement instrument cluster at a salvage yard.

Aug 30, 2014 | 1986 Chevrolet S-10 Blazer

1 Answer

My 2003 Saturn VUE is saying that I'm over-heating (both the warning light stays on, and the gauge stay pegged hot) even after my car has been sitting in the driveway for 2-3 days (or longer). There is not...


i'd change the engine temperature sender unit , or just disconnect it for a while and see if the gauge symptoms disappear , if they do then change the temp sender unit,if the symptoms remain i'd say get the OBD codes read as may have a faulty dash component

Jul 04, 2014 | 2003 Saturn VUE

2 Answers

Turnsover but won't start on hot days


This is a tough one something like this should be handled with a diagnostic tool. Seeing that your temperature gauge is pined when the engine is cold, your temperature sender could be sending false readings back to the computer, although your engine is equipped with the separate temperature sender for the engine control module. I once repaired a problem with the ignition coil, it would fail when hot, and start working again when it cooled down. This solution is really shot in the dark, I would pick up a diagnostic reader, they're not that expensive. GOOD LUCK

Jul 02, 2014 | 1994 Chevrolet C1500

1 Answer

Temp gauge pegging out, but engine isn't hot to the touch.


You could replace the sending unit to cross it off the list of possible problems.
You could check resistance cold and then with the engine at normal temp too. The gauge on the dash could be faulty too.

Jan 15, 2013 | 1998 Dodge Neon

2 Answers

Temp gauge is very erratic from cold to peg hot. engine not hot


Sounds like the temp sending unit is faulty.....

Nov 10, 2010 | 2000 Ford Explorer

1 Answer

1995 GMC suburban temp guage pegs high, but heater


Sounds like there may be an air pocket in the system.
Try 'burping' the system. If this still doesn't fix the problem, check the temperature of the heater core hoses (in and out) The inlet should be fairly cool, the other should be piping hot. If they're both cold; the heater core has an internal blockage.

Next, replace the thermostat with a winter (180-195 F) derivative.
Bleed the system accordingly, and keep me posted!

Nov 30, 2009 | 1990 GMC C2500

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